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Poverty is becoming more widespread in the Bay Area, according to new data released Thursday by the U.S. Census Bureau.

The percent of families living in poverty has increased significantly in parts of Marin, San Francisco and San Mateo counties that used to be solidly middle class, the data show.

"We are starting to see the long-term effects of the Great Recession. Many of these families lost jobs at the early part of the recession and are now literally tapped out," said Tom Peters, who heads the Marin Community Foundation.

A family with two adults and two children is living in poverty if its household income is less than $22,113, according to the federal government.

Nearly 15 percent of residents in the part of central San Rafael east of Highway 101 are now living in poverty, the data show. In downtown San Rafael, 10 percent of families live below the poverty line.

Areas where more than 10 percent of people are in poverty are dispersed throughout San Francisco's Richmond and Sunset districts. In one section of the Richmond adjacent to the Presidio, more than 20 percent of people are living below the poverty line.

The data also show that in many parts of the Bay Area, the wealthy and the poor live in close proximity to each other. In an area between Atherton and central Redwood City, more than 20 percent of people are living in poverty.

And in chronically economically disadvantaged areas in the region, poverty rates remain high. In the most impoverished parts of East Oakland and San Francisco's Bayview-Hunters Point, more than 35 percent of people live in poverty.

The map below shows the percent of people living in poverty by census tract.

Click on an area to see details, including the number of people living in extreme poverty — those earning less than half of of the federal poverty level.